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im so sorry this is so late but i hope i can still help.... its the 3rd one
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The thoracic duct: It begins near the lower part of the spine and collects lymph from the pelvis, abdomen, and lower chest.
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having exactly the same DNA sequences, twins start accumulating genetic variation from the earliest stages of development, researchers at Iceland-based company deCODE genetics found, meaning that one twin harbors variants that aren't present in the other.
I believe this difference in concentration of dissolved Particles from one location to another is called a concentration gradient.
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Defined as an organism whose presence, absence or abundance reflects a specific environmental condition,
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